Vibration isolating means for sewing machines



July 7, 1953 e. SAUER VIBRATION ISOLATING MEANS FOR SEWING MACHINES Filed Sept. 14. 1950 5 Sheets-Sheet 1 ,v FIGJ I 7 u A IN VEN TOR. GEORGE SAUER ATTORNEY.

July 7, 1953 G. SAUER 2,644,413

" VIBRATION ISOLATING MEANS FOR SEWING MACHINES- Filed Sept. 14. 1950 '5 Sheets-Sheet 2 az-ssaw-z-z'z-r 'll hl INVEA'IOR. GEORGE SAUER ATTORNEY.

July 7, 1953 G. SAUER 2,644,413

VIBRATION ISOLATING MEANS FOR SEWING MACHINES Filed Sept. 14, 1950 5 Sheets-Sheet 3 V IOQ 57 62 so 38 56 IN VEN TOR. GEORGE SAUER ATTORNEY.

July 7, 1953 I sAUER I 2,644,413.

I VIBRATION ISOLATING MEANS FOR SE WING MACHINES Filed Sept. 14,- 1950 5 Sheets-She et 4 INVENTOR. GEORGE SAUER ATTORNE y 5 v G.SAUERY 2,644,413

v VIBRATION ISOLATING MEANS FOR SEWINGVMACHINES Filed Sept. 14, 1950 I 5 Sheets-Sheet 5 wiry:

v III A INVENTOR. GEORGE SAUER ATTORNEY.

Patented July 7, 1953 UNITED STATES, PATENT "OFFICE VIBRATION ISOLATING MEANS FOR 1 SEWING MACHINE S George Sauer, Berwyn, Ill., assignor to Union Special Machine Company, Chicago, 111., a corporation of Illinois,

Application September 14, 1950, Serial No. 184,823

13 Claims. CL 112-214) have created a substantial amount of noise and vibration due to the repeated impact of the rapidly moving parts with each other or with stationary parts or with opposite faces of the work. Excessive noise and vibration has resulted particularly from the repeated contact between the feed dog of a four motion feed mechanism and the presser foot associated therewith, with or without the presence of intervening work and from the repeated blows of the presser foot against the throat plate.

A primary object of the present invention has been to eliminate such noise and vibration incident to the intermittent feeding of the work.

This has been accomplished through the isolation of vibrations imparted to particular elements in the manner indicated. In this way the building up of vibrations in large masses has been prevented and the vibration of even the small individual elements subjected to impact hasbeen eliminated or reduced to an unobjectionablei point.

In attaining the foregoing object, the invention contemplates the provision of a section or layer of relatively soft and yielding material, such as natural or synthetic rubber, between two parts or sections of various metallic elements which are normally formed as single, integral members. Thus, feed bars, feed dogs, presser bars, presser feet and the like are formed with an interposed section or layer of such soft, yielding material. and vibration, the feeding action is improved as a result of the ability of the work engaging portions' ofthe feed dog and the presser foot to yield slightly in the course of advancing the work. It insures full parallel surface contact between feed dog and presser foot in'advancing flat work and it enables these parts to conform with irregularities in the work produced by cross-seams and the like.

:Other objects, features and advantages of the invention will appear from a detailed description of certain embodiments of the same which In addition toeliminating noise will now be given in conjunction with the accompanying drawings, in which:

\ Fig. 1 is an end elevational view of a sewing machine embodying the invention, a cover plate for the needle head being removed;

Fig. 2 is a vertical sectional view through the base portion of the machine and through a portion of the needle head thereof;

Fig. 3 is an exploded perspective view of a feed bar'and feed dog and various connecting parts embodied in the machine;

Fig. 4 is an enlarged detail view, partly in elevation and partly in vertical section, showing the construction and relationship between the presser foot, feed dog, and throat plate of the machine;

Fig. 5' is a view similar to Fig. 4 showing a modified construction;

Fig. 6 is a vertical sectional view through the lower end of the presser bar and presser foot of Fig. 5, taken along the line 6-6 thereof;

Fig. 7 is a detail view, in perspective, illustrating a top feed foot which may be embodied in the machine;

Fig. 8 is an enlarged detail view similar to Fig. 5 showing a further modification;

Fig. 9 is a vertical sectional view along the line 99 of Fig. 8;

. shown) Fig. 10 is a vertical sectional view along the broken line Ill-Ill of Fig. 8;

Fig. 11 is a view similar to Fig. 5 showing a further modification; and

Fig. 12 is a detail view in section along the line iZ-IZ of Fig. 11.

Referring now particularly to Figs. 1 and 2 of the drawings, the invention is illustrated as applied to a fiat bed sewing machine of the general type disclosed in the patent to Sauer No. 2,286,441, granted June 16, 1942. It will be understood, however, that various features of the invention may be applied to sewing machines of a wide variety of diiferent types. The frame of the machine illustrated comprises a base Hi from one end of which rises a vertical standard carrying at its upper end an overhanging arm terminating in a needle head l2. A main rotary drive shaft i3 is provided in the base, this being driven by a combined handwheel and pulley '(not Shaft I3 is connected by suitable gearing, or by a belt drive, with a top rotary shaft M which extends longitudinally of the overhanging arm and terminates within the needle head. A crank 5, secured to the shaft l4 within the needle head, is connected by a link it with a 3 needle bar 58. A needle [9 carried by the lower end of the needle bar is arranged to be reciprocated by the latter toward and through the work supporting surface lea of the base. Cooperating with the needle beneath the work support is a complemental stitch forming device which may suitably be in the form of a d motion looper (not shown). This may be mounted and operated in the manner disclosed in said Sauer patent. It is secured to a rock shaft 29 which serves to impart needle avoid movements to the looper. The latter may be given its loop-seizing and shedding movements by suitable connections from the shaft 13, including a rock arm 21, as will be clear from said Sauer patent.

For advancing the workf'a d motion feed dog mechanism is provided. This includes a feed rocker 22 secured to a rock shaft .23'having an arm 24 which extends forwardly therefrom and is connected at its outer end with a pitman 25' cooperating with an adjustable eccentric 26 at the outer end of the shaft I3. Pivotally mounted upon the feed rocker 22, adjacent its upper end, is a feed bar 2'? which extends forwardly and carries, in a manner to be explained more fully hereinafter, a feed dog 28 (Fig; b. It will be understood that the rocking movements imparted to the feed rocker 22 by the eccentric 26 will impart feed and return movements to the feed dog 28. Lifting and lowering movements, to engage and disengage thefeed dog with and from the work, are imparted by connections including a downwardly extending arm 25; of the feed bar. This arm issimilar to arm 29a of Fig. 2, which forms part of a modified construction, and it is similarly connected by a pitman 30 with an eccentric 3| on the shaft !3. Cooperating with the feed dog is av presser foot' 32 secured to the lower end of a presser bar 33 which is yieldingsly urged downwardly by a spring 353 acting at its lower end against a collar 35 secured to the presser bar and at its upper end against the bottom of an adjustable sleeve 36. The latter has screw threaded engagement with a portion of the needle head frame and may be adjusted vertically, to y to ten ion f strin 3 y turnin a k url head 31 at the upper end of the sleeve. As will be understood, the feed dog 28; has its work engaging portion arranged to pass upwardly through suitable openings, in; a throat plate 38 (Fig. 2) mounted in the work supporting member lfia. As the feed dog is lifted, by the action of the eccentric 3|, it is brought into engagement with the bottom of the presser footti} orwit'n'the work interposed between the two elements and it-serves to lift the presser foot slightly from the throat plate. At this time the feed rocker imparts the feeding movement to the feed dog and on completion of such movement the feed dog is lowered. Assuming that the presserbar is capable of responding to the quick up and down movements of the feed dog, the presser foot 32 will be brought against the throat plate or will urge the interposed work,

against the latter as the feed dog, is 10\ ered. During high speed operations the presser bar may not be capable of responding so quickly and it may, therefore, remain in a slightly elevated position throughout the formation of a seam. In any event, however, it will be apparent that the repeated engagement of the feed dog with the under surface of the presser foot, with or withlowered into engagement with the throat plate upon each stitch-forming cycle the latter will likewise be subjected to repeated blows tendin to set up noise and vibration. Various expedients are provided by the present invention for the isolation of such vibrations.

Referring now to Fig. 4, the, presser foot is shown as comprising a work engaging portion 32, a shank portion 33 adapted to be secured to the lower end of the presser bar by a clamping screw 50, and an intermediate section 4! formed of natural or synthetic rubber or other similar material. It should be relatively soft and yieldable and have a certain elasticity tending to restore it to a predetermined shape upon release of pressure. Also, it should be capable of being bonded firmly to metal. The term rubber-like may be considered as aptly characterizing suitable materials. The parts 32 and 39 are formed of the usual metals and they are each bonded firmly to the rubber-like interlayer M. The bond for this purpose may be created by suitable heat and pressure in the course of assembling the parts or it may be provided by a suitable adhesive. A rubber cement marketed under the trade name and designation Plyobond No. 20 has been found quite satisfactory for the purpose. The bond may also be produced, if desired, by molding the interlayer-forming, rubber-dike composition in direct association with the parts to be united. The rubber-like interlayer may, if desired, be formed initially of somewhat larger area than required and the excess may then be trimmed away. To improve the. bond between the rubber layer and the metal surfaces, the latter may, if desired, be treated chemically with acid or the like to roughen the surfaces to which the rubber is to be bonded.

In a similar manner, the feed dog may be formed with a rubber or rubber-like interlayer between two. components. Thus the work-engaging, toothed. portion, 42 of the feed dog may be formed separately from the shank portion 4 and united with the. latter by an interposed layer 45: of: rubber or rubber-like material suitably bonded to the two parts in the same manner as: explained above. The shank MS may, if desired, be secured in the conventional, way, involving metal to metal contact, with the feed bar. HOV/ever, to minimize noise and vibration the arrangement. illustrated in Figs. 3 and 4 is preferably employed. The shank 44 is, provided with an elongated opening 46 permitting vertical adjustment of the feed dog on the feed bar. It is clamped on the latter by means of a screw d7 having threaded engagement with an opening 41a in the feed bar. To eliminate-metal to metal contact between parts of the. assembly, there is provided a channel element 43, formed preferably of, natural or synthetic rubber or other rubber-like material, this element being adapted to straddle the shank Q of the feed dog. It fits within a corresponding chan nel as formed either inan integral part of the feed bar 2-! or, as illustrated, in a separate ad= justably mounted part 5'). The latter is secured to the side of the feedbar by means of a pair of screws 51 and 52; Screw 51 passes through a circular opening in the member and its inner end is received by a screw-threaded opening in the feed bar, while screw 52 pas es through a vertically elongated, arcuate opening 53- in the member 50 and is received by a screw threaded opening inthe. feed bar. This enables angular adjustment, of the member 50 in relation to the tact is eliminated between the feed dog and the feed bar and between either of these and parts carried rigidly by the other.

As shown in Fig. 4, the throat plate 38, which is provided with an opening or openings 55 for the passage of the Work engaging portions of the feed dog, is of slightly less length than the distancebetween shoulders 56 and provided by rabbeted portions of the-work supporting member Illa. A slight clearance is thus provided at each end of the throat plate. Similar clearance is provided along the side edges of the throat plate. On flanged extensions 58, provided by the rabbeting of the work support, there are mounted strips 59 of rubber or rubber like material on which the throat plate rests. If similar flanges are provided beneath the side edges of the throat plate a rectangular gasket 'of rubber-like material may be employed in lieu of the separate strips. The strips 59 or the gasket may be bonded to the flangesti? in any suitable way. They are apertured in line with screw threaded openings in the flanges 58 to receive securing screws 6!} by which the throat plate is attached to the work support.- Rubber or other vibration absorbing washer at are provided be-= tween the heads of the screws 66 and the cooperating surfaces of the throat plate. These surfaces are provided at the bottoms of counterbores 62 in the upper surface of the throat plate, these counter-bores being somewhat larger in diameter than the heads of the screws 59. The arrangement is such that there is no metal to metal contact between the screws 6!) and any part of the throat plate.

From the foregoing it will be clear that any noise or vibration incidentto the blows struck by the feed dog against the under surface of the presser foot or by the latter against the throat plate will be isolated by the Various layers of rubber or rubber-like material. Moreover, the provision of the rubber insert 4| in the presser foot will enable a certain amount of tilting of the work engaging portion 32 thereof in relation to the shank 39. Thus as a cross seamv is encountered the rubber layer 4| will be compressed to a certain extent in some areas and possibly stretched slightly in other areas. So also, the rubber interlayer 35 in the feed dog as well as the rubber channel member 48 will permit slight yielding of the work engaging portion 42 of the feed dog in relation to the feed bar. This tends to insure full fiat engagement of the portion :32 with the work or with the under face of the presser foot.

In Fig. 2 there is shown additional means for eliminating noise and vibrations incident to the operation of the feed dog. As here shown, the

feed barz'ia may be formed in two'sections, one

of which is pivotally connected with the feed rocker 722a and has a downward extension 29a connected with the pitman;30 for lifting and lowering the same and the other of which, section 64, carries the adjustable feed dog support 50. The two metallic sectionsof the bar are united to form ,a single member by means of a relatively thin rubber or rubber-like section 6.3, which is suitablybonded' in one of the ways the yieldable mounting of the feed dog which enables the latter to. have flatsurface engagement withthe work or the presser foot. While it is desirable to provide all of the several noise and vibrationisolating means described in the foregoing, for both the presser foot and the feed mechanism, one or more of the rubber inserts may be omitted, if desired. For example, only the interposed rubber section 63 may be provided in'the feed mechanism and the other rubber sections or members may be omitted."

In Figs. 5 and-6 there is shown a modified arrangement for isolating noise, and vibrations in the pressermeans; In accordance with this embodiment; the presserbar 65 has secured to its lower end'a presser foot' shank 66 clamped to the bar by means'of a screw 61 which serves to draw together the two branches of a split collarlike portion :of the shank. The latter has a downwardly extending tongue 68 having a transversely extending 'openingin which is mounted and secured a pivot pin 69. At each side of the tongue a rubber or rubber-like element 10 is provided. 'This'surrounds the pin 69 and has an enlargedbase portion fittedbetween the face of the tongue 68andan opposed face of an upward extension ll of a presser'foot 12. The element it extends through the leg H and thus prevents any metal to metal contact between the presser foot and the shank or the pin 69. In this arrangement the presser foot may pivot in relation to the shank element in passing over cross seams and the like.

A somewhat similar arrangement is disclosed in Figs. 8, 9 and 10. Here the presser bar 13 is provided with a downwardly extending tongue 14 having a large transverse opening adapted to receive hub-like extensions of two vibration isolating elements 15 formed of rubber or the like. A pivot pin 16' carried by'upstanding legs 11 of a presserfoot 18 is journaled within the members 15. This permitstilting of the presser foot in relation to the presser bar andalso eliminates metal to metal'contact between these parts and. between the pin 16 and the tongue 14, so that noise and vibration are effectively isolated.

In Figs. 8 and 10, there is also illustrated a somewhat modified mounting for the feed dog. I The latter comprises an upper work-engaging,

serrated portion 19 andalower portion 80, the two parts being connected to form a single memher by means of-strip or section 8| of rubber or other vibration isolating material. The lower part has a downwardly extending shank 82 adapted to fit freely between two sides 84 and 85 of a-channel groove formed in a feed bar 83 or a separate support element similar to member 50 of Fig. 3. v A vibration and noise isolating element 8E is'provided between the opposed faces of the shank 82? and member 83. 'Element 86, formed preferably of rubber orrubb'er-like material, has a hub-like extension 81 mounted within an opening in the shank 82. If desired, the element 81 may be formed as a separate collar. Element 86 preferably has a pair offlanges disposed between the vertical edges of the shank 82 and the opposed faces of the channel groove in the bar 83. A washer 88 is provided on the outer face of the shank and the parts are secured in assembledrelation by a screw 89 having an s enlarged head. This screw has threaded engagement with the member 83 and its head is held out of contact with the shank 82 by the washer 88. This arrangement permits slight relative angular movement between the parts 82 and 83. The throat plate 96, provided with suitable openings for the passage of the work engaging portions of the feed dog, may be mounted in the same manner as the throat plate 38.

A still further modification is shown in Figs. 11 and 12. This involves a presser bar 9| which has a shank member 92 of a presser foot clamped thereto by means of a screw 93. Firmly bonded to the lower end of the shank is a bell shaped section 94 of vibration isolating material, such as rubber or the like. To the bottom face of this section is bonded the work engaging portion 950i the presser foot. In view of the shape and thickness of the section 9-1, substantial tilting of the foot 95 in relation to the shank 92 is permitted. At the same timeQof course, the vibrations of the metallic parts are isolated. As further shown in these views the feed dog may have its shank portion 9 5 secured directly, with metal to metal contact, to a forward portion 91 of a feed bar. This feed bar, which may suitably have the general contour of the bar 21 of Fig. 3, is completed by a rear'section 98 which has a relatively deep groove in its forward face adapted to receive a tongue 99 projecting rearwardly from the section 9?. A substantially U-shaped layer we of vibration isolating material, such as rubber or the like, is provided between the walls of the groove in the section 98 and the outer surfaces of the tongue 95. The element or layer I00 has outwardly extending flanges Iona interposed between the end surface of section 98 and opposed surfaces on section 91. The parts, as in the other embodiments, are firmly bonded together in one of the ways heretofore suggested. By virtue of the rubber layer Hit, the two sections of the feed bar are permitted to yield slightly in relation to each other and any vibrations imparted to the section 93 will be isolated.

Fig. 7 discloses a suitable form of top feed dog that may be employed in machines equipped with such dogs. It comprises a shank portion l0] having an elongated slot I02 by means of which it may be adjustably secured to the lower end of a top feed bar (not shown). The latter may be given suitable feed and return movements and may be lifted and lowered in relation to the work by any suitable means, such as that disclosed in the patent to Sauer No. 2,189,657, granted February 6, 1940. A shank Illl of the top feed dog is integrally connected with a substantially flat, U-shaped, metallic member N33 to the bottom of which is firmly bonded a layer We of synthetic rubber or the like. This layer not only assists in eliminating the noise incident to the rapid periodic engagement of the top feed dog with the throat plate or the Work, but it is also provides a good gripping surface for advancing the work. This feed dog may be used in combination with any of the other mechanisms described above.

Whiie various embodiments of the several features of the invention have been illustrated and described in considerable detail, it will be understood that nuinerous other changes may be made in the form and arrangement of the several parts without departing from the general principles and scope of the invention. Certain features described in relation to one embodiment may be used in connectionwith another to effect any desirable combination of the various vibration isolating means. It should be noted in this connection that while elimination or isolation of vibration and noise in any of the parts subjected to rapidly repeated blows will assist in reducing the overall noise created by the machine, effective elimination of objectionable vibration and noise requires the elimination or isolation of vibrations in all of the several parts indicated above.

What is claimed is:

1. A feed dog for sewing machines which comprises a metallic work engaging portion, a metallic supporting and attaching portion, and a connecting section formed of a yieldable, rubber-like material interposed between the two metallic portions, said connecting section being bonded to each or" the metallic portions and serving to retain the same in permanently assembled relation out of contact with each other and being of sufiicient dimension, to enable slight flexing of said portions in relation to each other.

2. A presser foot for sewing machines which comprises a metallic work engaging portion, a metallic sup-porting and attaching portion, and a connecting section formed of a yieldable, rubberlike material inter osed between the two metallic portions, said connecting section being bonded to each. of the metallic portions and serving to retain the in permanently assembled relation out of contact with each other and being of sufficient dimension to enable slight flexing of said portions in relation to each other.

3. In a sewing machine, work feeding devices including a four motion feed-dog and a presser foot, a feed bar for carrying said feed dog and a presser bar for carrying said presser foot, said iced dog and presser foot having opposed work engaging portions, and yieldable vibration isolating means interrupting metal to metal contact between parts serving to connect said work engaging portions of the feed dog and presser foot with their respective carrying bars, said yieldable means also enabling slight relative fiexing of said feed dog and presser foot in relation to their respective carrying bars.

l. In a sewing machine, work feeding devices including a four motion feed-dog and a presser foot, a feed bar for carrying said feed-=dog and a presser bar for carrying said presser foot, said feed dog and presser foot having opposed work engaging portions, and yieldable vibration isolating means interrupting metal to metal con tact between parts serving to connect said work engaging portions of the feed dog and presser foot with their respective carrying bars, said vibration isolating means including a section of yieldable, rubber-like material bonded to one of said work engaging portions and to a carrier therefor, said connection being of sufficient thickness to enable slight relative flexing of the parts to which it is bonded.

5. In a sewing machine having a four motion feed dog, presser means cooperating with said feed dogin advancingthe work, said presser means comprising a foot member having a work engaging portion and a shank, and a spring urged member to which said shank is secured whereby said work engaging portionis yieidingly urged against the work but is connected for move ment with said spring urged member away from the work, the connections between said Work engaging portion and said spring urged member including yieldable, rubber-like, vibration isolating means interposed between metallic parts and retaining the latter out of direct contact and enfeed bar adjacent one end thereof, means for shifting said bar longitudinally, means for lift ing and lowering the end of said bar at which said feed dog is secured thereto,said feed bar being formed by two metallic sections having interposed between the same a yieldable rubber-like insert, said insert being bonded to each of said sections and uniting the same to form a single member, said shifting means and said lifting and lowering means being connected with one of said sections, and said feed dog being secured to the other of said sections. V

7. In a sewing machine having a four motion feed dog having a work engaging portion, means including a feed bar for imparting four motion movements to said feed dog, presser means cooperating with said feed dog in advancing the work, said presser means comprising a foot member having a work engaging portion and a shank,

and a spring urged member to which said shank is secured whereby said work engaging portion is yieldingly urged against the work but is connected for movement with said spring urged member away from the work, the improvements comprising means formed of rubber-like material interposed in the connections between each of said work engaging portions of said feed dog and presser foot and their respective bars so disposed as to interrupt metal to metal contact between portions of said connections and thereby isolate vibrations imparted to said feed dog and presser foot.

8. In a sewing machine having a frame, a work supporting member carried by said frame and having an opening therein, a four-motion feeddog beneath said member provided with a work engaging'portion arranged to pass through said opening to engage work carried by said member and a presser foot above said member provided with a portion arranged to hold the work against the same and cooperating with said feed-dog to advance the work, the combination of means for carrying said feed-dog and said presser foot, means for imparting four-motion movements to said feed-dog carrying means, spring means for urging said presser foot against said member and said feed dog, yieldable means formed of rubberlike material interposed in the connections between said portion of said feed-dog and said movement imparting means and between said portion of the presser foot and said spring means for interrupting metal to metal contact between portions of said connections and isolating vibrations imparted to said work engaging portions of the feed-dog and presser foot, and yieldable rubber-like means interposed between said member and said frame for interrupting metal to metal contact between the same and isolating vibrations imparted to said member.

9. A feed bar for a sewing machine which comprises two metallic sections and a layer of rubberlike material interposed between and bonded to said sections for uniting the same into a unitary member, said sections being retained out of metal to metal contact by said layer, said layer of rubber-like material being sufiiciently thick to enable flexing of one of said sections in relation to the other one of said sections being provided with means through which four-motion movements may be imparted thereto, and theother of said sections being adapted for the mounting of afeed dog thereon.

tudinally thereof, a vibration isolating element.

formedv of rubber-like material interposed between said shank andthe several walls of said channel to retain said shank out of contact with said walls, means for securing said shank to said feed bar, and means formed of rubber lik material for preventing direct engagement of said securing means with at least one of the parts secured thereby.

11. Work feeding mechanism for sewing machines which comprises a feed bar, means for imparting four-motion movements to at least a part of said bar, a feed-dog mounted on said bar and arranged to receive four-motion movements therefrom, said feed bar having a channel in a face thereof, said feed-dog having a shank mounted in said channel and adjustable longitudinally thereof and a work engaging portion secured 'to said shank, said shank and work engaging portion being formed of metal and having a layer of rubber-like material bonded thereto to unite the same and interposed therebetween to retain the same out of metal to metal contact, a vibration isolating element formed of rubber-like material interposed between said shank and the 12. Work feeding mechanism for sewing machines which comprises a feed bar, means for imparting four-motion movements to at least a part of said bar, a feed-dog mounted on said bar and arranged to receive four-motion movements therefrom, a member adjustably secured to said feed bar andhaving achannel in a face thereof, said feed-dog having a shank mounted in said channel and adjustable longitudinally thereof and a work engaging portion secured to said shank, said shank and work engaging portion being formed of metal and having a layer of rubher-like material bonded thereto to unite the same and interposed therebetween to retain the same out of metal to metal contact, a vibration isolating element formed of rubber-like material interposed between said shank and the several walls of said channel to retain said shank out of contact with said walls, means for securing said shank to said member, and means formed of rubber-like material for preventing direct engagement of said securing means with at least one of the parts secured thereby, said layer of I rubber, said vibration isolating means, and said means formed of rubber-like material enabling said work engaging portion of said feed dog to tilt in relation to the channeled portion of said feed bar.

13. Presser means for a sewing machine which comprises a metallic presser bar and a metallic presser foot carried thereby, means for pivotally securing said foot to said bar, and means formed of rubber-like material interposed between said presser foot and presser bar and between one of the latter and said securing means for retaining the same out of metal to metal contact.

GEORGE SAUER.

References Cited in the file of this patent UNITED STATES PATENTS Number Number 12 Name Date Noble Apr. 12, 1910 Groebli May 5, 1925 Lord. Dec. 11, 1928 Gunn Jan. 12, 1932 Enright Apr. 25, 1932 MacPherson Apr. 30, 1942 Cumfer Sept. 15, 1942 Zeier Mar. 14, 1950 

